0.2.1

Patch release after 0.2.0 was already on crates.io. This ships the git delta that was mistakenly tagged as 0.2.0.

Added

• Response::into_json_with / json_with — single-step Bytes → T (ignores client json_parser).
• Error::hook / Error::is_hook — helpers for Error::Hook (variant existed since 0.2.0).

Changed

• Path :param encoding uses percent-encoding (same RFC 3986 unreserved set as before).
• README/docs: JSON fast path, Tower Buffer, ServiceBackend mutex, buffering limits.

Full notes: CHANGELOG.md